QmlJS: Share Context.
Previously Context was not entirely thread safe and had to be copied locally. Now it is thread safe and its lifetime managed by QSharedPointer. The non-safe parts were moved into ScopeChain in a previous commit. Change-Id: I851a93de85cbd6391dbea0fe33b011e2e093addb Reviewed-on: http://codereview.qt.nokia.com/1695Reviewed-by: Fawzi Mohamed <firstname.lastname@example.org>
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